[Bug] Credit Card button in-line form, lower-case postcodes trigger error

[UtopieStudio]

Library used

paypal-js (https://www.paypal.com/sdk/js)

🐞 Describe the Bug

Form input/submit error if user enters lower-case postcode (i.e p17 7bd, instead of P17 7BD)

🔬 Minimal Reproduction

Enter lower-case postcode, tab out, field error shown. On submit, console errors output.

😕 Actual Behavior

Lower-case postcode shows user form error message "enter a valid zip code". A non-existent - lower or upper-case - postcode error says "please enter a valid postcode".

app.8c25db1a1546298ad55e.js:2 scf_fetch_credit_form_submit_error {handledErrors: Array(1), unhandledErrors: Array(0), timestamp: '1740223425089', component: 'xo-card-fields', app_name: 'standardcardfields', …}

app.8c25db1a1546298ad55e.js:2 scf_recoverable_billing_address_field_error_on_submit {error_message: 'Enter a valid ZIP code', timestamp: '1740223425089', component: 'xo-card-fields', app_name: 'standardcardfields', token: '3HT495919D193080F', …}

🤔 Expected Behavior

API should handle lower case postcode entries more elegantly without needing to alert the user with an error. Current error is not descriptive confusing the user why postcode is not correct.

🌍 Environment

• OS: - Win 10
• Browser: latest Firefox && Brave

➕ Additional Context

none